Use the supplied extension when generating new files; the default is
ogg.

--pattern

Use the supplied pattern when generating new files. This is a Python
keyword format string with three variables, base for the original
file’s base name, stream for the stream’s serial number, and ext for
the extension give by –extension.

The default is %(base)s-%(stream)d.%(ext)s.

--m3u

Generate an m3u playlist along with the newly generated files. Useful
for large chained Oggs.